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President Barack Obama leads a briefingon the current situation in Libya by National Security Advisor Tom Donilon, foreground, and Chief of Staff Bill Daley during a secure conference call aboard Air Force One on the flight from Rio de Janeiro, Brazil, to Santiago, Chile, March 21, 2011. Taking part in the call are Secretary of State Hillary Clinton, Chairman of the Joint Chiefs of Staff Admiral Mike Mullen, Secretary of Defense Bob Gates, and AFRICOM Commander General Carter Ham. (Official White House Photo by Pete Souza)This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House. subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.